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Standalone and Parallel Operation Optimization of Uninterruptible Power Supplies

Hasanzadeh, Amin | 2009

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 40023 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mokhtari, Hossein; Karimi, Masoud
  7. Abstract:
  8. Increase of sensitive customers to power quality has raised concerns in industries regarding requirements of quality power supply. Uninterruptible Power Supplies (UPSs) are known as efficient tools in providing reliable power supply to sensitive customer. However, in a UPS, getting a desired output requires appropriate structural implementation and successful output voltage control. On the other hand, due to the increase in sensitive loads in customers, the output power range of UPSs has increased. Consequently, design and producing high power UPSs is not economical. In addition, tendency to have high reliability power supplies disrespect of their physical locations has moved researcher activities to control of parallel-connected structure of UPSs with minimal interconnections wires or communication circuits. The presence or absent of these interconnections has demonstrated two main load sharing methods; active load sharing and droop based. In this thesis, the performance of standalone and parallel-connected UPSs have been improved by using Internal Model Principle (IMP), optimization method of Linear Quadratic Regulator (LQR) and utilizing of state-feedback law. The output resonant controller coefficients are achieved in an optimum way. Furthermore, omission of output current sensor in parallel connected UPSs has simplified their power stage and has improved system noise immunity and reduced system overall price. The operation of the proposed system has been studied under different operating conditions for both linear and nonlinear loads. In this research, in addition to simulation, two experimental setups are designed and implemented to verify the performance of the proposed strategies
  9. Keywords:
  10. Optimal Control ; Parallel Operation ; Uninterruptible Power Supplies ; Resonant Controller

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